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  1. Core Server
  2. SERVER-21837

MongoD memory usage higher than wiredTigerCacheSizeGB for primary in replica set

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Details

    • Bug
    • Status: Closed
    • Major - P3
    • Resolution: Duplicate
    • None
    • None
    • Replication
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      3 node replica set on Windows (2 replicas and one arb).

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      3 node replica set on Windows (2 replicas and one arb).

    Description

      I've been watching mongod memory fairly closely (SERVER-20991,
      SERVER-20104 etc). With 3.2, memory usage on my non-replica-set deployment is excellent and it is well within expectations for the given wiredTigerCacheSizeGB.

      Testing a replica-set with the same workload, the memory appears to push past this limit significantly: using a 4GB argument, actual memory usage is at 6.5 GB fairly quickly after kicking off the run.

      I haven't done a full run yet, but will attempt to do so to see if memory keeps climbing or if it levels off.

      Attachments

        1. memory.png
          memory.png
          174 kB
        2. memory-early.png
          memory-early.png
          167 kB
        3. metrics.2015-12-16T05-49-34Z-00000
          9.45 MB

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              Unassigned Unassigned
              nick@innsenroute.com Nick Judson
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                Updated:
                Resolved: